Parts for your 2015 Subaru Exiga-Throttle position sensors

2015 Subaru Exiga throttle position sensor: purpose, care and replacement

Based on Subaru factory service information for the 2015 Exiga/Crossover 7 (Electronic Throttle Control system description), Subaru diagnostic sections covering DTCs P0121–P0123 (Throttle Position Sensor circuit), and Subaru parts catalogues that list an electronic throttle body assembly with integrated dual throttle position sensors, this model absolutely uses throttle position sensors. They’re built into the throttle body and monitored by the engine control module alongside the accelerator pedal position sensor.

On the 2015 Exiga, the throttle position sensor (TPS) tells the ECU exactly how far the throttle plate is open. That data is used to meter fuel, stabilise idle, manage cruise control, coordinate the CVT’s shift strategy, and support torque requests for traction and stability systems. Subaru fits two TPS tracks inside the throttle body for redundancy, so the ECU can cross-check signals for safety.

There’s no set replacement interval for the TPS on this model, but staying on top of basic care makes a big difference. If the car’s idling rough, hesitating off the line, dropping into limp mode, or throwing the check engine, traction or cruise lights with codes like P0121–P0123 or throttle actuator faults, it’s time for a look.

• Keep the throttle body clean: remove the intake duct and gently clean the bore and plate with throttle body cleaner. Don’t flood the sensor area.
• Inspect the connector and loom: look for corrosion, oil wicking, brittle insulation, or poor pin tension that can skew readings.
• Replace the throttle body gasket if removed, and torque fasteners evenly to avoid air leaks.
• Perform throttle/idle learning with a scan tool (Subaru Select Monitor or equivalent) after cleaning or replacing parts. A short drive cycle can also help the ECU relearn.

On the 2015 Exiga the TPS is integral to the throttle body, so replacement typically means swapping the complete throttle body assembly rather than just the sensor. Many workshops in Aus/NZ prefer genuine parts for signal accuracy and durability, especially with CVT-equipped cars. After fitting, confirm there are no intake leaks, clear codes, and run a throttle learning routine. If the vehicle still behaves oddly, check for software updates and re-test the accelerator pedal sensor so you’re not chasing the wrong end of the system.

Regular servicing, a clean air path, and sound wiring keep the Exiga’s electronic throttle sharp, helping fuel economy, smooth take-offs, and hassle-free WOF/rego checks.

Does the 2015 Subaru Exiga have a separate, removable TPS?

No. For this model, the throttle position sensors are built into the electronic throttle body. In normal practice the assembly is replaced as a unit, then a throttle/idle relearn is performed.

What symptoms point to a dodgy TPS on a 2015 Exiga?

Common signs include erratic idle, flat spots on acceleration, cruise control dropping out, the traction or check engine light coming on, and codes like P0121–P0123. Sometimes the CVT feels indecisive because the ECU isn’t getting clean throttle angle data.

Do I need to calibrate anything after replacing the throttle body?

Yes. Run a throttle/idle learn with a scan tool, confirm no vacuum leaks, and clear any fault codes. A short drive cycle helps the ECU refine fuelling and throttle behaviour.